This is a note to let you know that I've just added the patch titled
of/address: Fix of_node memory leak in of_dma_is_coherent
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
of-address-fix-of_node-memory-leak-in-of_dma_is_cohe.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5560234426e0974ae75609b4fdafb24391add8fd
Author: Evan Nimmo <evan.nimmo@xxxxxxxxxxxxxxxxxxx>
Date: Tue Nov 10 15:28:25 2020 +1300
of/address: Fix of_node memory leak in of_dma_is_coherent
[ Upstream commit a5bea04fcc0b3c0aec71ee1fd58fd4ff7ee36177 ]
Commit dabf6b36b83a ("of: Add OF_DMA_DEFAULT_COHERENT & select it on
powerpc") added a check to of_dma_is_coherent which returns early
if OF_DMA_DEFAULT_COHERENT is enabled. This results in the of_node_put()
being skipped causing a memory leak. Moved the of_node_get() below this
check so we now we only get the node if OF_DMA_DEFAULT_COHERENT is not
enabled.
Fixes: dabf6b36b83a ("of: Add OF_DMA_DEFAULT_COHERENT & select it on powerpc")
Signed-off-by: Evan Nimmo <evan.nimmo@xxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20201110022825.30895-1-evan.nimmo@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/of/address.c b/drivers/of/address.c
index da4f7341323f2..37ac311843090 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -1043,11 +1043,13 @@ out:
*/
bool of_dma_is_coherent(struct device_node *np)
{
- struct device_node *node = of_node_get(np);
+ struct device_node *node;
if (IS_ENABLED(CONFIG_OF_DMA_DEFAULT_COHERENT))
return true;
+ node = of_node_get(np);
+
while (node) {
if (of_property_read_bool(node, "dma-coherent")) {
of_node_put(node);
